Effects of Eccentric Pre-loading on Concentric Vertical Jump Performance in Young Female Athletes
作者机构：Department of KinesiologyMississippi State University236 McCarthy GymnasiumStarkvilleMS 39762USA College of Health SciencesThe University of Texas at El PasoEl PasoTX 79968USA College of MedicineUniversity of Nebraska Medical CenterOmahaNE 68198USA Department of Nutrition&Health SciencesUniversity of Nebraska-LincolnLincolnNE 68583USA
出 版 物：《Journal of Science in Sport and Exercise》 (体育运动科学（英文）)
年 卷 期：2021年第3卷第1期
页 面：98-106页
学科分类：0710[理学-生物学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 0403[教育学-体育学] 0832[工学-食品科学与工程（可授工学、农学学位）] 1004[医学-公共卫生与预防医学(可授医学、理学学位)] 04[教育学] 1002[医学-临床医学] 1001[医学-基础医学(可授医学、理学学位)] 1010[医学-医学技术（可授医学、理学学位）]
基 金：Efforts for this study were funded,in part,by the University of Nebraska Agriculture Research Division with funds provided by the Hatch Act(Agency:U.S.Department of Agriculture,National Institute of Food and Agriculture,Accession No:1000080,Project No:NEB-36-078) a grant from Abbott Nutrition,Columbus,OH
主 题：Stretch-shortening cycle Youth Ground reaction force Kinetics
摘 要：Purpose This study examined changes in vertical jump performance with progressively greater eccentric pre-loading in relation to growth and development in young female *** Twenty young female athletes ranging from 9 to 17 years old performed the following vertical jumps in random order:static jumps(SJs),counter-movement jumps(CMJs),and drop jumps(DJs)from drop heights of 20,30,and 40 cm(DJ20,DJ30,and DJ40,respectively).Measurements included peak force(PF),peak rate of force development(RFD),peak power(PP),eccentric impulse(ECC),and concentric impulse(CON).Measurements of growth included age,maturity offset,height,body mass,fat-free mass,and thigh muscle cross-sectional area(CSA).Results PF increased from the SJ-DJ20(P0.009),then plateaued from DJ20-DJ40(P=1.000).RFD remained the same from SJ-CMJ(P=1.000),increased from CMJ-DJ20(P0.001),and plateaued from DJ20-DJ40(P=0.874).PP increased from the SJ-CMJ(P0.001),then plateaued from the CMJ-DJ40(P≥0.486).CON remained the same across all verti-cal jumps(P=1.000),while ECC increased from the SJ-DJ40(P≤0.038).Jump height(JH)increased from the SJ-CMJ(P0.001),decreased from CMJ-DJ20(P0.001),and plateaued from DJ20-DJ40(P=1.000).The change in PP from the SJ-CMJ(ΔCMJ-SJ)was related to all measurements of growth except CSA(r=0.558-0.815).Conclusion Young females produced greater power during the CMJ than SJ,but equivalent power from the CMJ-DJ40,despite increases in ***,ΔCMJ-SJ was not related to CSA,which suggests other underlying mechanisms affect stretch-shortening cycle utilization in young female athletes.
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